JP6342028B1 - Power generation control device for vehicle alternator - Google Patents

Abstract

A power generation control device for an automotive alternator capable of executing a scan test of a digital circuit in a package state is provided. A P terminal 22 connected to an armature coil, a LIN terminal 21 for LIN communication, and an interface circuit 102 are provided. The interface circuit 102 receives serial signals input from the P terminal 22 and the LIN terminal 21. The scan test signal converted into a parallel signal and input from the P terminal 22 and the LIN terminal 21 is transmitted to the digital circuit 105, and the scan test signal output from the digital circuit 105 is transmitted to the LIN terminal 21. [Selection] Figure 1

Description

  The present invention relates to a power generation control device for a vehicle AC generator, and more particularly to a power generation control device for a vehicle AC generator that can execute a scan test of a digital circuit in a packaged state.

  A power generation control device for an AC generator for a vehicle is usually composed of a semiconductor integrated circuit including a circuit that monitors a battery voltage and adjusts an excitation current supplied to a field coil so as to be a target set voltage. The number of package terminals of this power generation control device is such that, for example, in the power generation control device package 10 having a LIN (Local Interconnect Network) communication interface as shown in FIG. E terminal, F terminal for supplying exciting current to the field coil, input terminal connected to the armature coil of the AC generator for vehicles (hereinafter referred to as P terminal), communication terminal for LIN communication (hereinafter referred to as P terminal) Hereinafter, five terminals (LIN terminals) are provided. A terminal to which a phase voltage signal is input may include two terminals, a P1 terminal and a P2 terminal.

  A power generation control device for a vehicle AC generator includes a digital circuit on which an analog circuit control function, a communication function, and the like are mounted. A scan test method is known as a failure diagnosis method for this digital circuit. In the scan test, for communication of test data, SCAN_RST that is a signal for resetting a circuit at the time of scanning, SCAN_EN that is a signal for enabling a scan circuit, SCAN_IN that is data of a scan path shift register, a shift At least five terminals for inputting or outputting the signals SCAN_CLK that is the operation clock signal and SCAN_OUT that is the observation output signal are required. However, in the package 10 of the power generation control device with a limited number of terminals as shown in FIG. 5, there is a problem that the scan test cannot be executed in the package state because the terminals cannot be assigned for the scan test.

  In addition, in the power generation control device having the LIN communication interface, data can be transmitted and received by LIN communication. However, since the LIN communication function implemented in the digital circuit is invalidated during the scan test, LIN communication is used. Scan test data cannot be sent or received.

  Although the scan test can be executed by increasing the number of package terminals for the scan test, there is a problem that the cost increases when the number of package terminals is increased.

  In order to inspect the function of the digital circuit in the power generation control device in the package state, it is necessary to inspect by operating the circuit function instead of the scan test. For this reason, there are problems such as a long inspection time and a low failure detection rate. In addition, when a failure occurs in the manufactured LSI, the scan test is effective as a method for determining whether the failure point is a failure of the digital circuit. However, in order to execute the scan test, the package is opened and the LSI is opened. It was necessary to take out the device and remount it into a package that can be wire-bonded to the scan test terminal.

  As a conventional technique of this type, for example, in Japanese Patent Laid-Open No. 03-033666 (Patent Document 1), in a logic integrated circuit having a test terminal of a scan path, one of the input terminals and a scan mode control (SMC) terminal are used together. Thus, a configuration in which the number of dedicated test terminals is reduced from the conventional three to two is disclosed.

  Further, for example, Japanese Patent Publication No. 2006-514296 (Patent Document 2) discloses a configuration using a bidirectional serial signal and a signal format including a plurality of time slots as a diagnostic circuit communication interface of an integrated circuit. .

  Furthermore, for example, in Japanese Patent Application Laid-Open No. 01-209754 (Patent Document 3), by measuring the degree of logic change of an input signal from an external pin, the external pin is used for data signal input and control signal input. A configuration for switching and using the external pins is disclosed.

JP 03-033666 (page 2, lower left column, line 10-same lower right column, line 17, line 1) JP-T-2006-514296 (paragraphs 0019, 0022, FIG. 1, FIG. 2) JP-A-01-209754 (page 3, upper left column, line 4-same lower right column, line 4, FIG. 2)

  As described above, the power generation control device for an AC generator for a vehicle cannot perform a digital circuit scan test in a packaged state due to the limitation of the number of package terminals, and therefore there is a problem that the inspection time of the digital circuit becomes long. There was a problem that the failure detection rate was low. Further, when a failure occurs in the manufactured LSI, it is difficult to determine whether the failure is a digital circuit.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle AC generator power generation control device capable of executing a digital circuit scan test in a packaged state.

In order to achieve the above object, a power generation control device for a vehicle alternator according to the present invention includes an input terminal connected to an armature coil of the vehicle alternator, a communication terminal for LIN communication, and the input. An interface circuit connected to a terminal and the communication terminal, and converting a serial signal input from the input terminal and the communication terminal into a parallel signal;
The scan test signal input from the input terminal and the communication terminal is transmitted from the interface circuit to the digital circuit switched to the scan test mode, and the scan test signal output from the digital circuit is transmitted to the communication terminal. In a vehicle AC generator power generation control device that performs a scan test in a package state ,
The scan test signal input to the communication terminal is a signal for resetting the circuit at the time of scanning, a signal for enabling the scan circuit, and data of a scan path shift register, and is input to the input terminal. The scan test signal is a shift operation clock signal, and the scan test signal output from the communication terminal is an observation output signal.

  According to the power generation control device for a vehicle alternator according to the present invention, even if the power generation control device for the vehicle alternator is in a package state, a scan test that is a failure diagnosis method for a digital circuit can be executed. Therefore, it is possible to shorten the inspection time of the digital circuit by the scan test and improve the failure detection rate. In addition, it is easy to determine whether a digital circuit is faulty when a fault occurs after manufacturing.

It is a figure which shows the structure of the electric power generation control apparatus of the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a figure which shows the timing chart in the case of operate | moving for every 4 bits in the electric power generation control apparatus of the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the electric power generation control apparatus of the alternating current generator for vehicles which concerns on Embodiment 2 of this invention. It is a figure which shows the timing chart in the case of operate | moving for every 4 bits in the electric power generation control apparatus of the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is a figure which shows the package of the power generation control apparatus of the AC generator for vehicles.

  A preferred embodiment of a power generation control device for an automotive alternator according to the present invention will be described below with reference to the drawings. In each figure, the same numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a power generation control device for an automotive alternator according to Embodiment 1 of the present invention. In FIG. 1, the power generation control device 101 includes the LIN terminal 21, the P terminal 22, and the interface circuit 102 described above. The LIN terminal 21 has SCAN_RST, which is a signal for resetting the circuit at the time of scanning, as data for scan test, SCAN_EN, which is a signal for enabling the scan circuit, and SCAN_IN, which is data for the scan path shift register. And a SCAN_CLK signal, which is a clock signal for shift operation, is input to the P terminal 22. The input signal is resistance-divided, shaped by the comparators 103 and 104, and input to the interface circuit 102.

  The interface circuit 102 converts a serial signal for scan test input from the LIN terminal 21 and the P terminal 22 into a parallel signal for transmission to the digital circuit 105. In the scan test in the package state, the converted parallel signal and the SCAN_CLK signal input from the P terminal 22 are input to the digital circuit 105 via the first multiplexer 106. When a scan test signal is input from the scan test dedicated terminal 107, the signal input from the scan test dedicated terminal 107 by the first multiplexer 106 is input to the digital circuit 105.

  The SCAN_OUT signal that is the observation output signal output from the digital circuit 105 is output to the output circuit 108 via the interface circuit 102, and the SCAN_OUT signal is output from the LIN terminal 21. During normal operation, the second multiplexer 109 outputs a LIN communication signal.

The LIN terminal 21 and the P terminal 22 are provided with a comparator that resistance-divides the input signal as a function inherent to the power generation control device and shapes the waveform into a digital signal. Therefore, the comparator 103 and 104 for waveform-shaping the signals for scan testing are possible shared with the comparator, to assign LIN terminal 21 and the P terminal 22 as a terminal for inputting a scan test signal is the advantage that no additional circuitry is there.

Further, since the LIN terminal 21 includes an output circuit as an original function of the power generation control device, the output circuit 108 that outputs the SCAN_OUT signal can be shared with the output circuit of the LIN terminal 21 . Therefore, assigning the LIN terminal 21 as a terminal for outputting the SCAN_OUT signal has an advantage that no additional circuit is required.

  The interface circuit 102 outputs the first multiplexer 106, the second multiplexer 109, and the SCAN_CLK signal to the digital circuit 105 for selecting the serial / parallel conversion circuit 110 and the signal input / output to / from the scan test dedicated terminal 107. A clock output determination circuit 111 is provided.

Serial-parallel conversion circuit 110, SC AN _RST inputted from LIN terminal 21, SCAN_EN, a shift register for each signal SCAN_IN, stores data of several bits that is determined minutes in sequence in the shift register. While the value is stored in the shift register, the clock output determination circuit 111 masks the SCAN_CLK signal so that the SCAN_CLK signal is not output to the digital circuit 105 . When the data reception of each signal is completed, the value stored in the shift register is output to the digital circuit 105 together with the SCAN_CLK signal from the next clock. Reference numeral 112 denotes a scan mode determination circuit. The scan mode determination circuit 112 is a circuit that detects a predetermined signal pattern that is not input during normal operation and switches the digital circuit 105 to the scan test mode.

FIG. 2 is a diagram illustrating a timing chart of the interface circuit 102, and illustrates a case where the serial / parallel conversion circuit 110 includes a 4-bit shift register.
In FIG. 2, A to R represent signals indicating High and Low. The serial signal input from the LIN terminal 21 is sequentially stored in the shift register in the serial / parallel conversion circuit 110 every 4 bits. During this period, the clock signal at the P terminal 22 is used as a clock for the shift register. After storing the 12-bit signal, the interface circuit 102 sequentially outputs the values stored in each shift register to the digital circuit 105 in the next four clocks. At this time, the clock of the P terminal 22 is output to the digital circuit 105 via the clock output determination circuit 111 as the SCAN_CLK signal. The SCAN_OUT signal output from the digital circuit 105 is output from the LIN terminal 21 via the interface circuit 102. The scan test is executed by repeating the above operation and transmitting / receiving scan data every 4 bits.

  Next, a method for switching to the scan test mode in the package state will be described. In order to perform the scan test, it is necessary to switch the digital circuit 105 to the scan test mode. The power generation control device according to the first embodiment is characterized in that when a signal that is not input in normal operation is received as an alternator, the scan test mode in the package state is switched.

  As a method of switching to the scan test mode, it is possible to switch to the scan test mode by inputting a frequency higher than the frequency of the phase voltage signal normally input to the P terminal 22. Normally, since the frequency of the phase voltage signal is 4000 Hz or less, a signal having a frequency higher than 4000 Hz is input to switch to the scan test mode in the package state.

As another method of switching to the scan test mode, it is possible to switch to the scan test mode by inputting a signal to the F terminal of the package 10 (see FIG. 5 ). The F terminal is an output terminal during normal operation, but a signal is input from the outside to the terminal, and if it is equal to or higher than a predetermined frequency, the scan test mode in the package state is switched.

As described above, according to the power generation control device for a vehicle alternator according to the first embodiment, even if the power generation control device for the vehicle alternator is in a package state, the scan that is a failure diagnosis method of the digital circuit 105 is performed. Since the test can be executed, the inspection time of the digital circuit 105 by the scan test can be shortened and the failure detection rate can be improved. In addition, it becomes easy to determine whether or not the digital circuit 105 is faulty when a fault occurs after manufacturing.

Embodiment 2. FIG.
Next, a description will be given of a power generation control device for an automotive alternator according to Embodiment 2 of the present invention.
FIG. 3 is a diagram illustrating a configuration of a power generation control device for an automotive alternator according to the second embodiment. In FIG. 3, the power generation control device 101 includes a LIN terminal 21, a P terminal 22, an F terminal 23, and an interface circuit 102. The power generation control device for an automotive alternator according to the second embodiment is characterized in that the F terminal 23 is used as a terminal for outputting the SCAN_OUT signal, as compared with the first embodiment. For this reason, the input / output switching control of the LIN terminal 21 is not necessary, and there is an advantage that the control circuit is simplified. Other than the above, the second embodiment is the same as the first embodiment, and the same reference numerals are given and description thereof is omitted.

Since the F terminal 23 includes an output circuit as an original function of the power generation control device, the output circuit 113 that outputs the SCAN_OUT signal can be shared with the conventional output circuit of the F terminal. Therefore, assigning the LIN terminal 21 as a terminal for outputting the SCAN_OUT signal has an advantage that no additional circuit is required.

FIG. 4 is a diagram illustrating a timing chart of the interface circuit 102 according to the second embodiment when the serial / parallel conversion circuit 110 includes a 4-bit shift register. In the timing chart of FIG. 4 , the SCAN_OUT signal is output from the F terminal 23.

  According to the power generation control device for a vehicle alternator according to the second embodiment, it is possible to obtain the same effect as that of the power generation control device for a vehicle AC power generator according to the first embodiment, and to output a SCAN_OUT signal. Since the F terminal 23 is used as the terminal to perform the input / output switching control of the LIN terminal 21 is unnecessary, there is an advantage that the control circuit is simplified.

  In the above, the first embodiment and the second embodiment have been described. However, the present invention is not limited to this, and these configurations may be appropriately combined or configured without departing from the spirit of the present invention. It is possible to add some deformation to the above or to partially omit the configuration.

21 LIN terminal, 22 P terminal, 23 F terminal, 101 power generation control device, 102 interface circuit, 103, 104 comparator, 105 digital circuit, 106 first multiplexer, 107 scan test dedicated terminal, 108, 113 output circuit, 109 first 2 multiplexers, 110 serial / parallel conversion circuit, 111 clock output determination circuit, 112 scan mode determination circuit

Claims (6)

An input terminal connected to an armature coil of an AC generator for a vehicle;
A communication terminal for LIN communication;
An interface circuit that is connected to the input terminal and the communication terminal and converts a serial signal input from the input terminal and the communication terminal into a parallel signal;
The scan test signal input from the input terminal and the communication terminal is transmitted from the interface circuit to the digital circuit switched to the scan test mode, and the scan test signal output from the digital circuit is transmitted to the communication terminal. In a vehicle AC generator power generation control device that performs a scan test in a package state ,
The scan test signal input to the communication terminal is a signal for resetting the circuit at the time of scanning, a signal for enabling the scan circuit, and data of a scan path shift register, and is input to the input terminal. The scan control signal is a clock signal for shift operation, and the scan test signal output from the communication terminal is an output signal for observation .   2. The scan test signal output from the digital circuit is transmitted to an output terminal to which a field coil of the vehicle alternator is connected, so that the scan test can be executed in a package state. A generator control device for an AC generator for a vehicle according to claim 1. The power generation control device for a vehicle alternator according to claim 2 , wherein the scan test signal output from the output terminal is an observation output signal. During normal operation detects a predetermined signal pattern that is not input, vehicle AC generator according to any one of claims 1 to 3, characterized in that switch the digital circuitry in a package state in the scan test mode Power generation control device. Detecting that a predetermined frequency or more signals is input to the input terminal, a vehicle according to any one of claims 1 to 3, characterized in that switch the digital circuitry in a package state in the scan test mode AC generator power generation control device. Detecting that a predetermined frequency or more signals is input to said output terminal, the power generation of the vehicular alternator according package state to claim 2 or 3, characterized in that switch the digital circuitry in the scan test mode Control device.

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